Tail end buffering structure of compression air cylinder

Abstract

The utility model relates to the technical field of compression cylinders, in particular to a tail end buffer structure of a compression cylinder. Comprising a cylinder body, a piston is arranged in the cylinder body, a buffer channel is arranged in a front end cover, an upper boss is arranged at the position, corresponding to the buffer channel, of the top of the piston, and the upper boss is in clearance fit with the buffer channel; a hydraulic cavity is formed between the piston and the rear end cover, a hydraulic oil inlet and outlet is formed in the rear end cover, a lower boss is arranged at the position, corresponding to the hydraulic oil inlet and outlet, of the bottom of the piston and is in clearance fit with the hydraulic oil inlet and outlet, a plug is installed at the bottom of the lower boss, and a thin hole is formed in the plug. When the piston is in use, the gap between the upper boss and the buffer channel is very small, gas can play a certain buffer role between the top of the piston and the front end cover, and the collision force between the top of the piston and the front end cover is reduced; the hydraulic oil can play a certain buffering role between the bottom of the piston and the rear end cover, and the collision force between the bottom of the piston and the rear end cover is reduced.

Description

Technical field:

[0001] The utility model relates to the technical field of compression cylinders, in particular to an end buffer structure of a compression cylinder. Background technology:

[0002] Currently, ion liquid-sealed compression cylinders are a new type of equipment used to pressurize gas in hydrogen refueling stations. Their structure is described in patent application publication number CN116044712A, which discloses an ionic liquid compressor. Ionic liquid is injected into the compression chamber of the cylinder to cool and lubricate the piston and improve the sealing effect between the piston and the cylinder. Hydraulic oil is pumped into and out of the hydraulic chamber at the bottom of the cylinder to hydraulically drive the piston up and down. However, in actual operation, when the piston moves upward, the top of the piston is prone to collision with the front cover, and when the piston moves downward, the bottom of the piston is prone to collision with the rear cover. Currently, there is no buffering structure between the top of the piston and the front cover, or between the bottom of the piston and the rear cover. The collision force is large, and long-term operation can cause deformation and damage to the piston and end cover, affecting their service life. Currently, there is no good solution.

[0003] In summary, the problem of large impact force between the end of the piston and the end cover in the compression cylinder has become a technical problem that urgently needs to be solved in the industry. Utility model content:

[0004] In order to make up for the deficiencies of the prior art, the utility model provides an end buffer structure of a compression cylinder, which solves the problem of large collision force on the front cover and the rear cover when the piston moves up and down.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A terminal buffer structure of a compression cylinder comprises a cylinder body, a front end cover and a rear end cover are provided at both ends of the cylinder body, an intake valve and an exhaust valve are provided on the front end cover, a piston is provided in the cylinder body, a gas compression chamber is formed between the piston and the front end cover, a buffer channel is provided in the front end cover, an upper boss is provided at a position corresponding to the buffer channel on the top of the piston, and a clearance fit is made between the upper boss and the buffer channel; a hydraulic chamber is formed between the piston and the rear end cover, a hydraulic oil inlet and outlet are provided on the rear end cover, a lower boss is provided at a position corresponding to the hydraulic oil inlet and outlet on the bottom of the piston, and a clearance fit is made between the lower boss and the hydraulic oil inlet and outlet, a plug is installed at the bottom of the lower boss, a fine hole is provided in the plug, and a plurality of side holes connected to the fine hole are provided on the side of the lower boss.

[0007] The buffer channel is arranged vertically.

[0008] An ionic liquid is provided on the top of the piston, and the ionic liquid is used for cooling, lubricating and sealing between the piston and the cylinder body.

[0009] An ionic liquid inlet is provided on a side wall of the cylinder body on one side of the gas compression chamber.

[0010] A plurality of sealing rings and guide rings are arranged between the piston and the cylinder body.

[0011] The bottom of the lower boss is located inside the hydraulic oil inlet and outlet or extends to the outside of the hydraulic oil inlet and outlet.

[0012] The plug is threadedly connected to the lower boss.

[0013] The utility model adopts the above solution and has the following advantages:

[0014] By providing a buffer channel in the front end cover, an upper boss is provided at the position of the buffer channel on the top of the piston, and the gap between the upper boss and the buffer channel is matched. When the piston moves up to the top, after the upper boss enters the buffer channel, due to the small gap between the upper boss and the buffer channel, the discharge speed of the gas remaining in the gas compression chamber is slowed down, and these gases will play a certain buffering role between the top of the piston and the front end cover, reducing the collision force between the top of the piston and the front end cover, and protecting the top of the piston and the front end cover; when the piston moves down to the bottom, after the lower boss enters the hydraulic oil inlet and outlet, due to the small gap between the lower boss and the hydraulic oil inlet and outlet, a plug is installed at the bottom of the lower boss, and a fine hole is provided in the plug. Part of the hydraulic oil in the hydraulic chamber is discharged from the gap between the lower boss and the hydraulic oil inlet and outlet, and the other part enters the fine hole from the side hole of the lower boss and is discharged. In this way, the discharge speed of the hydraulic oil is slowed down, and these hydraulic oils will play a certain buffering role between the bottom of the piston and the rear end cover, reducing the collision force between the bottom of the piston and the rear end cover, and protecting the bottom of the piston and the rear end cover, avoiding deformation and damage of the piston and the front and rear end covers due to collision, and ensuring their service life. Description of the drawings:

[0015] Figure 1 This is a schematic diagram of the structure of the upward movement of the piston of the utility model.

[0016] Figure 2 This is a schematic diagram of the structure of the downward movement of the piston of the utility model.

[0017] Figure 3 It is a schematic diagram of the structure of the utility model with the lower boss extended.

[0018] In the figure, 1. cylinder body, 2. front end cover, 3. rear end cover, 4. intake valve, 5. exhaust valve, 6. piston, 7. gas compression chamber, 8. buffer channel, 9. upper boss, 10. hydraulic chamber, 11. hydraulic oil inlet and outlet, 12. lower boss, 13. plug, 14. fine hole, 15. side hole, 16. ionic liquid, 17. ionic liquid inlet, 18. sealing ring, 19. guide ring. Specific implementation method:

[0019] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0020] like Figure 1-3 As shown, an end buffer structure of a compression cylinder includes a cylinder body 1, a front end cover 2 and a rear end cover 3 are provided at both ends of the cylinder body 1, an intake valve 4 and an exhaust valve 5 are provided on the front end cover 2, a piston 6 is provided in the cylinder body 1, a gas compression chamber 7 is between the piston 6 and the front end cover 2, a buffer channel 8 is provided in the front end cover 2, an upper boss 9 is provided at the top of the piston 6 corresponding to the buffer channel 8, and a clearance fit is provided between the upper boss 9 and the buffer channel 8; a hydraulic chamber 10 is provided between the piston 6 and the rear end cover 3, and the hydraulic chamber 10 is used to drive the piston 6 to move up and down to realize hydraulic drive of the piston 6, a hydraulic oil inlet and outlet 11 is provided on the rear end cover 3, a lower boss 12 is provided at the bottom of the piston 6 corresponding to the hydraulic oil inlet and outlet 11, and a clearance fit is provided between the lower boss 12 and the hydraulic oil inlet and outlet 11, a plug 13 is installed at the bottom of the lower boss 12, a fine hole 14 is provided in the plug 13, and a plurality of side holes 15 connected with the fine hole 14 are provided on the side of the lower boss 12.

[0021] The buffer channel 8 is arranged vertically.

[0022] An ionic liquid 16 is provided on the top of the piston 6 , and the ionic liquid 16 is used to cool, lubricate and seal the piston 6 and the cylinder body 1 .

[0023] An ionic liquid inlet 17 is provided on the side wall of the cylinder body 1 on one side of the gas compression chamber 7 , through which ionic liquid can be replenished into the gas compression chamber 7 .

[0024] Several sealing rings 18 and guide rings 19 are provided between the piston 6 and the cylinder body 1 to play a sealing and guiding role.

[0025] When the piston 6 descends to the bottom, the bottom of the lower boss 12 can be located exactly inside the hydraulic oil inlet and outlet 11, which can reduce the overall piston length and lower the height of the entire machine. The bottom of the lower boss 12 can also be lengthened and extended to the outside of the hydraulic oil inlet and outlet 11, which can reduce the volume of the hydraulic chamber 10 and increase the pressure of the hydraulic chamber 10.

[0026] The plug 13 is threadedly connected to the lower boss 12 .

[0027] Working principle:

[0028] During operation, the hydraulic oil enters and exits the hydraulic chamber 10 through the hydraulic oil inlet and outlet 11, which can realize the hydraulic drive of the piston 6, causing the piston 6 to move up and down. When the piston 6 moves downward, the gas enters the gas compression chamber 7 through the intake valve 4 and the buffer channel 8. When the piston 6 moves upward, the gas in the gas compression chamber 7 is compressed and pressurized, and then discharged outward through the buffer channel 8 and the exhaust valve 5, thereby realizing the pressurization of the gas. When the piston 6 rises to the top, after the upper boss 9 enters the buffer channel 8, due to the small gap between the upper boss 9 and the buffer channel 8, the discharge speed of the gas remaining in the gas compression chamber 7 slows down, and these gases will play a certain buffering role between the top of the piston 6 and the front cover 2, reducing the collision force between the top of the piston 6 and the front cover 2, and protecting the top of the piston 6 and the front cover 2; when the piston 6 descends to the bottom, after the lower boss 12 enters the hydraulic oil inlet and outlet 11, due to the small gap between the lower boss 12 and the hydraulic oil inlet and outlet 11, at the same time, the lower boss 1 2 is installed at the bottom of the plug 13, and a fine hole 14 is provided in the plug 13. A part of the hydraulic oil in the hydraulic chamber 10 is discharged from the gap between the lower boss 12 and the hydraulic oil inlet and outlet 11, and the other part enters the fine hole 14 from the side hole 15 of the lower boss 12 and is discharged. In this way, the discharge speed of the hydraulic oil is slowed down, and the hydraulic oil will play a certain buffering role between the bottom of the piston 6 and the rear end cover 3, reducing the collision force between the bottom of the piston 6 and the rear end cover 3, protecting the bottom of the piston 6 and the rear end cover 3, avoiding deformation and damage of the piston 6 and the front and rear end covers due to collision, and ensuring their service life.

[0029] The above specific implementation methods cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or transformation made to the implementation methods of the present utility model falls within the protection scope of the present utility model.

[0030] Anything not described in detail in the present invention is well known to those skilled in the art.

Claims

1. A terminal buffer structure of a compression cylinder, characterized in that: It includes a cylinder body, two ends of which are provided with front end covers and rear end covers, an intake valve and an exhaust valve are provided on the front end cover, a piston is provided in the cylinder body, a gas compression chamber is between the piston and the front end cover, a buffer channel is provided in the front end cover, an upper boss is provided at the position of the buffer channel on the top of the piston, and a clearance fit is made between the upper boss and the buffer channel; a hydraulic chamber is formed between the piston and the rear end cover, a hydraulic oil inlet and outlet is provided on the rear end cover, a lower boss is provided at the position of the hydraulic oil inlet and outlet on the bottom of the piston, and a clearance fit is made between the lower boss and the hydraulic oil inlet and outlet, a plug is installed at the bottom of the lower boss, a fine hole is provided in the plug, and a plurality of side holes connected to the fine hole are provided on the side of the lower boss.

2. The end buffer structure of a compression cylinder according to claim 1, characterized in that: The buffer channel is arranged vertically.

3. The end buffer structure of a compression cylinder according to claim 1, characterized in that: An ionic liquid is provided on the top of the piston, and the ionic liquid is used for cooling, lubricating and sealing between the piston and the cylinder body.

4. The end buffer structure of a compression cylinder according to claim 3, characterized in that: An ionic liquid inlet is provided on a side wall of the cylinder body on one side of the gas compression chamber.

5. The end buffer structure of a compression cylinder according to claim 1, characterized in that: A plurality of sealing rings and guide rings are arranged between the piston and the cylinder body.

6. The end buffer structure of a compression cylinder according to claim 1, characterized in that: The bottom of the lower boss is located inside the hydraulic oil inlet and outlet or extends to the outside of the hydraulic oil inlet and outlet.

7. The end buffer structure of a compression cylinder according to claim 1, characterized in that: The plug is threadedly connected to the lower boss.

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